Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.3204p&link_type=abstract
American Astronomical Society, SPD meeting #37, #32.04; Bulletin of the American Astronomical Society, Vol. 38, p.258
Astronomy and Astrophysics
Astronomy
Scientific paper
In this paper we make an attempt to explain the suppression of amplitude of 5-min. acoustic oscillations inside sunspot. A program for numerical simulation of propagation of acoustic waves in 3D has been developed. Realistic top boundary condition is a characteristic feature of this program. Nonreflecting boundary condition based on PML layer is established above the temperature minimum, and absorbs all waves not reflected by photosphere. Acoustic sources with random amplitudes and phases were distributed below the photosphere. Sources were masked in a central circle, simulating the absence of acoustic sources inside sunspots. Large scale simulations in rectangular box of size 120Mm x 120Mm x 50Mm showed that acoustic amplitude is approximately 4 times lower in the region without sources in comparison with the quiet Sun. This is in a good agreement with observations. Hence, the observed suppression of oscillations in sunspots can be explained by the lack of acoustic sources in sunspot areas where strong magnetic field inhibits convection.
Kosovichev Aleksandr G.
Parchevsky Konstantin V.
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